The headline on September 12 read: “Fatherhood Cuts Testosterone, Study Finds, for Good of the Family.” The article – on the front page of the NY Times – told of a recent study that found that becoming a father and engaging in childcare decreases a man’s testosterone levels. For the scientists who produced the study, and for the newspaper’s science reporter alike, there is but a single, inevitable (and thus extra-cultural) consequence of this reported drop in testosterone levels: it makes men, on their view, less likely to seek multiple sex partners and more likely to be monogamous. The decrease in testosterone is thus “adaptive” to parenting, by virtue of it leading a man to be more anchored to a child’s mother—with the presumption (in the study and news report alike) being that the child in question is indeed the father’s genetic child (as well as the mother’s). What these scientists and the NY Times's science journalist are entirely blind to is the possibi...
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